2-甲基咪唑合成原液蒸发精馏分离

Evaporating and distillating separation of 2-methyl imidazole synthesis solution

简述了2-甲基咪唑合成分离方法,指出了原工艺中存在的问题,提出2-甲基咪唑合成原液蒸发精馏新分离方法。通过实验得到最佳的工艺条件:原液剩余量约占取样量40%;填料柱高度为0.5 m;回流比为8∶1;冷凝液的温度为10°C以下。在该条件下分离2-甲基咪唑的效果最佳,收率约为80.1%,且可回收4.5%的白色固体(即乙醛合氨)。

We introduce the separating method of synthesized 2-methyl imidazole synthesis,point out the problems existing in the original process,and put forward a new separating method of 2-methyl imidazole synthesis solution,that is,combination of evaporation and distillation.Through the experiment,we get the best technological processing condition： The liquid residual volume accounts for about 40% of the sampling volume;the height of packed column is 0.5 meters;the reflux ratio is 8∶1;the condensate temperature is below 10 ℃.Under the condition,the yield is about 80.1% and 4.5% of the white solid（i.e.acetaldehyde ammonia） can be recycled.